Dan Harris wrote:
Carin Westblom wrote:
How can I easily find specific tables and/or databases with a lot of
space that may be reclaimed w a vacuum full?
I picked up this tip on the list a while ago:
SELECT pg_namespace.nspname, pg_class.relname, pg_class.reltuples,
pg_class.relpages, rowwidths.avgwidth, ceil(pg_class.reltuples *
rowwidths.avgwidth::double precision /
current_setting('block_size'::text)::double precision) AS expectedpages,
pg_class.relpages::double precision / ceil(pg_class.reltuples *
rowwidths.avgwidth::double precision /
current_setting('block_size'::text)::double precision) AS bloat,
ceil((pg_class.relpages::double precision *
current_setting('block_size'::text)::double precision -
ceil(pg_class.reltuples * rowwidths.avgwidth::double precision)) /
1024::double precision) AS wastedspace
FROM ( SELECT pg_statistic.starelid, sum(pg_statistic.stawidth) AS
avgwidth
FROM pg_statistic
GROUP BY pg_statistic.starelid) rowwidths
JOIN pg_class ON rowwidths.starelid = pg_class.oid
JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace
WHERE pg_class.relpages > 1;
then do:
select * from relbloat order by wastedspace desc;
I forgot to add that the select needs to be prepended by:
create view relbloat as ...
sorry about that!
-Dan
---------------------------(end of broadcast)---------------------------
TIP 4: Have you searched our list archives?
http://archives.postgresql.org
